linux-kernel - Re: [PATCH v3 2/2] watchdog/hardlockup: Avoid large stack frames in watchdog_hardlockup

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Message-ID: <ZMyt47ptEp2z4BIT@dhcp22.suse.cz>
Date:   Fri, 4 Aug 2023 09:50:59 +0200
From:   Michal Hocko <mhocko@...e.com>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        kernel test robot <lkp@...el.com>,
        Lecopzer Chen <lecopzer.chen@...iatek.com>,
        Pingfan Liu <kernelfans@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/2] watchdog/hardlockup: Avoid large stack frames in
 watchdog_hardlockup_check()

On Thu 03-08-23 16:07:58, Douglas Anderson wrote:
> After commit 77c12fc95980 ("watchdog/hardlockup: add a "cpu" param to
> watchdog_hardlockup_check()") we started storing a `struct cpumask` on
> the stack in watchdog_hardlockup_check(). On systems with
> CONFIG_NR_CPUS set to 8192 this takes up 1K on the stack. That
> triggers warnings with `CONFIG_FRAME_WARN` set to 1024.
> 
> We'll use the new trigger_allbutcpu_cpu_backtrace() to avoid needing
> to use a CPU mask at all.
> 
> Fixes: 77c12fc95980 ("watchdog/hardlockup: add a "cpu" param to watchdog_hardlockup_check()")
> Reported-by: kernel test robot <lkp@...el.com>
> Closes: https://lore.kernel.org/r/202307310955.pLZDhpnl-lkp@intel.com
> Signed-off-by: Douglas Anderson <dianders@...omium.org>

Acked-by: Michal Hocko <mhocko@...e.com>

Thanks!
-- 
Michal Hocko
SUSE Labs